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39+2k=7(k+7)
We move all terms to the left:
39+2k-(7(k+7))=0
We calculate terms in parentheses: -(7(k+7)), so:We get rid of parentheses
7(k+7)
We multiply parentheses
7k+49
Back to the equation:
-(7k+49)
2k-7k-49+39=0
We add all the numbers together, and all the variables
-5k-10=0
We move all terms containing k to the left, all other terms to the right
-5k=10
k=10/-5
k=-2
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